/* * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com) * Licensed under the GPL */ #ifndef __SYSDEP_STUB_H #define __SYSDEP_STUB_H #include <sys/mman.h> #include <asm/ptrace.h> #include <asm/unistd.h> #include <asm/page.h> #include "stub-data.h" #include "kern_constants.h" #include "uml-config.h" extern void stub_segv_handler(int sig); extern void stub_clone_handler(void); #define STUB_SYSCALL_RET EAX #define STUB_MMAP_NR __NR_mmap2 #define MMAP_OFFSET(o) ((o) >> PAGE_SHIFT) static inline long stub_syscall0(long syscall) { long ret; __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall)); return ret; } static inline long stub_syscall1(long syscall, long arg1) { long ret; __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1)); return ret; } static inline long stub_syscall2(long syscall, long arg1, long arg2) { long ret; __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), "c" (arg2)); return ret; } static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3) { long ret; __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), "c" (arg2), "d" (arg3)); return ret; } static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3, long arg4) { long ret; __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), "c" (arg2), "d" (arg3), "S" (arg4)); return ret; } static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3, long arg4, long arg5) { long ret; __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)); return ret; } static inline void trap_myself(void) { __asm("int3"); } static inline void remap_stack(int fd, unsigned long offset) { __asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;" "movl %7, %%ebx ; movl %%eax, (%%ebx)" : : "g" (STUB_MMAP_NR), "b" (UML_CONFIG_STUB_DATA), "c" (UM_KERN_PAGE_SIZE), "d" (PROT_READ | PROT_WRITE), "S" (MAP_FIXED | MAP_SHARED), "D" (fd), "a" (offset), "i" (&((struct stub_data *) UML_CONFIG_STUB_DATA)->err) : "memory"); } #endif